Hans Jensen Lubricators A/S - 100 years

FAQ

FAQ

 

Newbuildings

 

For newbuildings we recommend our HJ Lubtronic and HJ SIP technology. HJ Lubtronic and HJ SIP form a unique combination of lubrication pump and injection valves that ensures the optimum condition for cylinder liner and piston rings. Here you can read the frequently asked questions.

 

Q: Why should we specify HJ Lubtronic and HJ SIP for our newbuildings?

A: HJ Lubtronic and HJ SIP are designed to meet the challenge of ensuring optimal liner and piston ring condition by optimal lubrication and thereby safeguarding engine reliability and to obtain the lowest consumption of CLO - and at the same time become a greener fleet due to reduced particle emission.

 

To further explain; difficult industry conditions have driven vessel operators and owners to seek further operating efficiencies in order to optimize costs which as lead to different operation conditions of the 2 stroke marine diesel engines today. With the background of high bunker costs, this has led to the widespread adoption of “slow steaming” primarily to save bunker cost but also to avoid laying-up ships. Other measures include T/C cut out, derating, propeller and hull modifications etc.

 

The main engines of today are therefore fuel-optimized and designed to comply with new environmental legislations including difference in pressure and temperature conditions.

 

This situation have made the engines more prone to excessive wear of liners and pistons (exemplified by “cold corrosion” on the liners) and increased the need for more effective lubrication including more effective neutralization of the sulphuric acid formed during the combustion. As a countermeasure many engines today are forced to use a relatively high amount of base/BN (cylinder oil). The high consumption of base is not just a matter of increased costs it is just as well a matter of environmental considerations as engine smoke formation and oil sludge production naturally is increased with the cylinder oil consumption.

 

Read more about the benefits of HJ Lubtronic and HJ SIP here.

 

Q: Are HJ Lubtronic and HJ SIP approved by engine designers?

A: Yes

  • HJ Lubtronic and HJ SIP are approved by MAN Diesel & Turbo. (Click here for our approval)
  • HJ Lubtronic and HJ SIP are approved by China Shipbuilding Power Engineering Institute (CSPI) for their own designed engine “CSSC-EX340EF-U/A”.
  • HJ SIP is also approved by Mitsubishi Heavy Industries. Read more here: http://www.cimac.com/publication-press/technical-database/index.html

 

Q: We are using MDT Engines on our new buildings - Will my engine warranty remain unchanged by installing HJ Lubtronic SIP or HJ SIP in combination with another lubrication system?

A: Yes.

 

Q: Where can I find documentation supporting the claimed advantages of HJ Lubtronic and HJ SIP?

A: Over the years, our lubrication systems have been subject to many different tests on various engine types and under various conditions. A few well documented examples are, as well as many case stories [here](link):

 

  • CIMAC Paper 283, ”Lubtronic SIP promise remarkably low wear rates with low CLO consumption” (2016) by Hans Jensen Lubricators, Costamara and MAN Diesel & Turbo.
  • "The result of the tests on the cylinders equipped with HJ SIP and HJ Lubtronic in combination is remarkable in terms of cylinder lube oil consumption, liner wear and cylinder condition. The remarkable result is achieved despite operation with varying sulphur content in the fuel and low load on a newly designed engine. MDT observed that SIP lubricated units was properly lubricated with less oil than the remaining units. The combination of the HJ SIP injection valve and the HJ Lubtronic lubricator is proven to be an effective lubrication system, controlling the amount of cylinder oil injected per stroke and ensuring an optimal distribution of the oil on the cylinder liner wall…”

Read paper at http://hjlubri.dk/en/news/read-full-hjl-cimac-paper-2016

 

  • CIMAC Paper, “Swirl injection lubrication – A new technology to obtain low cylinder oil consumption without sacrificing wear rates” (2001) by A. P. Møller Maersk Line, MET Motoren- und Energietechnik GmbH and Hans Jensen Lubricators.
  • Cylinder wear and cylinder lubrication oil consumption are essential parameters for the operating economy of large 2-stroke diesel engines. Therefore it is of great economic importance to minimize the cylinder wear and/or the consumption of cylinder oil. The new HJL SIP lubrication concept meets these demands. Tests in service have shown a potential of up to 50 % cylinder oil savings without trade-off in liner wear. The experiments and tests carried out with a new lubrication system, based on the new technology of injecting cylinder oil into the air swirl in the engine cylinder, prove that the system can work as expected with low cylinder and piston ring wear rates even with very low cylinder oil dosages. The paper describes the system and the methods used in designing and testing the system, before final testing in service. The results obtained during approximately 10,000 hours of service are described and discussed.

Read paper at http://www.cimac.com/publication-press/technical-database/index.html

 

  • CIMAC Paper 43, The latest developments and technologies of the UE engines” (2007) by Mitsubishi Heavy Industries.
  • (…) Shipowners reported that in case of large container ships, the rate of cylinder oil cost dominates more than 80% of the total maintenance costs of marine diesel engines. Therefore, reducing cylinder oil consumption can contribute to a reduction in ship operating costs. The SIP system is an epoch-making cylinder lubrication system that can decrease cylinder oil consumption, and the number of installations has been increasing each year. The SIP system injects cylinder oil like a spray, and eliminates cylinder oil being splashed up and down due to piston ring movement. (…)”

Read paper at http://www.cimac.com/publication-press/technical-database/index.html

 

Q: How do we specify HJ Lubtronic and/or HJ SIP?

A: The earlier you specify HJ Lubtronic and/or HJ SIP, the easier it is:

 

1.     Before signing the contract with the S/Y, owners that wish to use HJ Lubtronic and/or HJ SIP should retrieve confirmation from the S/Y that the engine (no matter who the maker is) will be delivered with HJ Lubtronic and or HJ SIP.

2.     If the S/Y contract signed, but maker not selected, the owner (or S/Y depending on what owners’ agreement is with the S/Y) should ask the potential engine makers to confirm that the engines will be delivered with HJ Lubtronic and or HJ SIP.

3.     If the engine maker selected, the ship owner can request the engine maker to change the lubrication system.

 

Q: We feel some reluctance from the engine maker or yard to adopt HJ Lubtronic and/or HJ SIP. Why is this?

A: In order to win an order the engine maker will offer the standard package in order to increase own competitiveness. This is done despite the fact that the optimum cylinder lubrication technology will improve the engine reliability and save customers cost in the long term. That being said, it is our experience from numerous projects, that in spite of some initial commercial reluctance from the maker, engine makers will supply our system if the owners insists. We believe that the owners, who pays for the ship and will be operating the ships for the years to come, shall be able to get whatever (approved) technology that the owner prefers.

 

Q: What will my CLOC be with HJ Lubtronic and/or HJ SIP?

A: According to our experience, a feed rate 20-50 % lower than the standard lubrication system can be expected, but cylinder oil requirements depend on many factors including what acceptable wear rate the owners expect. Therefore we refer to our prevailing service letters regarding oil consumption.

 

Q: What is the minimum allowed feed rate?

A: We recommend that you always follow the engine designer’s and engine maker’s guidelines, especially within in the engine warranty period.

 

Q: How do HJ Lubtronic and HJ SIP fight cold corrosion?

A: HJ technology will, at normal operation, refresh the oil film at each piston stroke with a smaller amount of oil per injection and thereby minimizing the oil spill. This reduces the risk of oil film starvation, which benefits Low Oil Stress – it reduces the risk of cold corrosion, minimizes cylinder liner wear, piston ring wear, and scuffing. Our higher frequency is due to the technological advantages of our HJ Lubtronic lubricator, and our improved distribution is due to the technological advantages of our HJ SIP valves.

 

To further explain; oil film can be considered as an oil reservoir, wherefore when using intermittent cylinder oil injection into the ring pack (such as the standard system of many engine makers), the oil film will to some extent degrade between injections due to pollution by combustion residues, i.e. wear particles, unburned carbon particles, water and sulphur, and thereby also sulfuric acid. Due to this degeneration of the oil, High Oil Stress is present, and the risk of starvation of the oil film is present and the risk of cold corrosion, high cylinder liner wear, piston ring wear and scuffing.

 

Q: Which BN grade should be used with HJ Lubtronic + HJ SIP?

A: HJ Lubtronic + HJ SIP allows lower BN grades due to frequently injected and better distribution of CLO and an thereby optimum utilization of BN.

 

HJ Lubtronic + HJ SIP allow the use of same BN grade during high and low S%; instead the F/R will automatically be adjusted accordingly.

 

You should always follow the recommendations from engine maker/designer within the warranty period.

 

Q: Can HJ SIP be combined – as an upgrade – on engine maker standard lubrication systems?

A: Yes. HJ SIP can be added, as an upgrade, to the most lubrication systems.

 

Q: Why apply HJ SIP, as an upgrade, in combination with standard lubricators?

A: The SIP system can reduce cylinder oil consumption dramatically via the spray injection, because the thin and uniform oil film distribution is made on the upper liner surface, which is effective in reducing waste oil splashed up and down by the ring movement. In addition, use of the SIP system can achieve a reduction of the ring and liner wear rate, improvement of the ring and liner condition, and a reduction of particulate matter. HJ SIP, in combination with standard lubricators, will result in an improved utilization of the injected CLO, which results in lower CLOC (MHI, 2007, CIMAC Paper no. 43)

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